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Continuity mistake: In one of the most endearing scenes from one of the greatest movies of all times, nobody noticed that as Dorothy sings "Over the Rainbow" the haystack she's standing next to just materializes between shots. Later it disappears long before the twister reaches the house. If you watch the movie you'll see the exact spot where the haystack should be seen as Aunt Em gives Dorothy a cruller and says to her, "and find yourself a place where you won't get into any trouble". (00:07:25)

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Revealing mistake: As they exit the Tin Man's scene singing, "We're off to see the Wizard", a bird stretching its wings is casting a shadow on the painted sound stage wall slightly to the right of the house, which reveals it to be a fake backdrop instead of an open area. (00:47:45)

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Continuity mistake: After both Dorothy and Scarecrow have oiled Tin Man's elbows, Dorothy pulls the Tin Man's arm down and we see her throw the apple that she's holding down behind him. In the next shot it reappears in her left hand. (00:41:55)

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Continuity mistake: When Dorothy comes running into the farm at the beginning of the movie, there's a lone cow in the pen behind her and a couple of white chickens that she ends up chasing in the direction of the camera as she runs near the house. Two shots later the cow disappears and the white chickens are now in the pen. (00:02:55)

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Continuity mistake: As he holds the Wizard's balloon, the Tin Man has his heart shaped clock attached to his chest at the sixth rivet. The next time we see him several seconds later it's attached to the third rivet. (01:34:50)

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Continuity mistake: In the beginning of the movie Dorothy comes running into the farm and there's an old tire hanging from a tree. Two shots later as she walks away from Aunt Em and Uncle Henry the tire has been moved. The angle at which it hangs has been changed and the piece of rope hanging on the bottom of it is now three or four inches closer to dead center than it was before. (00:03:00)

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Visible crew/equipment: There's a second window on the left of Dorothy's bed and the shadow of the stage light can be seen on the wall behind it. (00:17:15)

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Continuity mistake: After the Scarecrow gets his diploma he says, "How can I ever thank you enough" and the diploma is near his face. In the next shot it's at his side. (01:30:15)

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Continuity mistake: Inside the cyclone, looking out the window the wind is blowing left to right. In the room the wind is blowing in the window from the right. (00:18:05)

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Continuity mistake: Prof. Marvel reaches to open the door of his wagon as he walks Dorothy in. In the next shot the door is already open. (00:12:45)

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Continuity mistake: Dorothy faces the Munchkins as they sing, "We welcome you to Munchkinland". In the next shot she's facing the Mayor. (00:28:30)

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Continuity mistake: In the cyclone, Toto runs up to the window and barks at a cow. In the next shot Toto is gone. (00:18:00)

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Visible crew/equipment: Aunt Em gives Dorothy a cruller and says to her, "…and find yourself a place where you won't get into any trouble". Just as Aunt Em runs away you can see an equipment shadow fall across Dorothy's dress. (00:05:20)

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Continuity mistake: During the storm the farm hands let the horses go and Dorothy runs to the back of the house as the wind blows directly in her face. If you look closely a large wood plank is sent sliding on the road, in the wrong direction into the wind. (00:15:50)

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Continuity mistake: The house we see in the cyclone has all of it's windows intact. When it lands they're all out. (00:18:40)

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Revealing mistake: When Dorothy runs to the back of the house during the storm a crewmember is moving the rocking chair in the room on the left. The wind never stops blowing, but the chair stops moving after it's left alone. (00:16:35)

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Continuity mistake: As Zeke feeds the pigs we see his hankie sticking straight up out of his back pocket. He doesn't touch it but later before he pulls it out after rescuing Dorothy, it's hanging downward and much more is showing. (00:04:00)

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Continuity mistake: When Dorothy runs to the back of the house during the storm the field in the background is not the same as we saw a few shots earlier as Aunt Em calls for her. (00:15:35 - 00:16:45)

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Continuity mistake: When Glinda starts singing, "Come out, Come out" she's not on the Yellow Brick Road. In the next shot she is. (00:22:55)

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Continuity mistake: As she talks to the Scarecrow, Dorothy says to Toto, "Wasn't he pointing the other way?". In several of the close up shots wind is blowing her hair around and in others it isn't. (00:34:30)

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